Crank-planer.



No. 991,919. PATENTBD JUNE 30, 1908. H. E. 9 E. 9. EBERHARDT.

CRANK PLANER. APPLICATION FILED DBO. 6,1905.

UNITED STATES PATENT OFFICE.

HENRY E. EBERHARDT AND ELMER G. EBERHARD'L OF NEWARK, NEW JERSEY, ASSIGNORS, BY MESNE ASSIGNMENTS, TO MACHINE SALES COMPANY, OF NEW YORK, N. Y., A CORPO- RATION OF NEW YORK.

CRANK-PLANER.

Specification of Letters Patent.

Patented June 30, 1908.

To all whom it may concern:

Be it known that we, HENRY E. EBER- HARDT and ELMER G. EBERHARDT, both citi zens of the United States, and both residing at 113 Orchard street, Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Crank-Planers, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to a metal-shapingmachine or crank-planer having two sideframes with means to support aworkpiece thereon, and a pitman oscillated between the frames to reciprocate a ram upon the top of the frames, and thus having the gearing for operating the ram located between the sideframes. Such side-frames are thus furnished with disconnected parallel ways upon the top, and the edges of the ram are fitted to slide in such ways, the forward end of the ram which carries the tool-overhanging the workpiece and often pressed forcibly upward by the action of the tool. In such construc tion the pitman vibrates in a lon slot in the top of the frame, which divides t e frame in two so that its opposite edges can not be tied firmly to one another, as would be desirable.

Any guide upon the ram which tends to spread *the frames apart obviously impairs the support of the ram; while any kind which avoids the spreading of the frame tends to hold the ram itself more firmly in v a rectilinear path. Heretofore, such rams have been provided at their opposite edges with flanges fitted to variously shaped grooves in the ways, the most common being of dovetailed or rectangular form but it has been found that dovetailed flan es oper ate to crowd the ways apart, and w ere rectangular flan es have been used to avoid this effect, diffiou ty has been found in compensating for the wear, as the wear occurs in both horizontal and vertical directions and requires compensation in two directions; whereas the wear upon a dovetailed or angular'fitting can be compensated by an adjustment in a single direction.

Adjustable gibs are commonly bolted upon the ways and fitted to the flanges to hold the flanges in place, and to compensate for wear. Flanges with dovetailed edges have been used most frequently, but the upward strain upon the ram, which is often very great in making a heavy out with the tool, presses the dovetailed edges of the flanges severely against the gibs, which tends to strain the gibs outwardly and operates in practice to crowd the upper parts of the frames apart and permit the ram to swerve from a rectilinear path.

The present invention furnishes improved guides for the ram, which avoid the crowding of the frames apart and at the same time avoid the defects in a mere rectangular fittin by providing a triangular rib upon the laottom of each of the flanges fitted to a corresponding triangular groove in the disconnected ways. The upper side of the flange is formed with a rabbeted seat having a horizontal face and a vertical face, so that the longitudinal gib may be fitted to both of such faces and resist both upward and lateral movement of the ram. The gib operates to hold the triangular rib in the triangular groove, which thus guides the ram firmly without any tendency to spread the said frames apart, and operates by the engagement of the two ribs with the two grooves upon the ways, to secure their conjoint resistance to any lateral thrust. The wear upon the triangular ribs may also be compensated by a more vertical adjustment of the gib.

The invention will be understood by reference to the annexed drawing, in which Figure 1 is a side elevation of a shaping machine provided with the improvements; and Fig. 2 is a cross section of the ram and adjacent parts upon the top of the frame.

The machine is" shown with a box-frame A having vertical guides B upon the front, upon which a crossh'ead C is mounted to support the saddle D which carries the box-table E and vise F to hold the workpiece. The ram G carries the tool H over the workpiece, and is reciprocated by the oscillating pitman I shown in Fig. 2 and gearing inclosed between the side-plates of the frame A.

The top of the frame is provided, as shown in Figs. 2 and 3, with parallel'disconnected ways J, which are provided in the upper surface with longitudinal triangular grooves 70, and the ram is formed at the lower edge with opposite laterally projecting flanges E, from t e under sides 0 which triangular ribs m are projected and fitted to the triangular grooves. The upper side of each flange E is formed with a rabbeted seat having a horizontal face m and a vertical face m and a longitudinal gib I is held adjustably by bolts I over the tops of the flanges E, and has its lower and inner sides fitted to the faces m and m The gibs are primarily fitted to hold the triangular ribs m movably in the grooves it, but prevent any lifting of the flanges or the ram under the upward strain of the tool. The triangular ribs and grooves tend, as is well known, to wear continually in a straight line and to thus primarily maintain the rectilinear movement of the ram while the fitting of the gibs to the horizontal faces m affords a means of readily compensating for the wear, by setting the gibs a little lower upon the ways J.

It will be observed that the engagement of the two ribs m with the two grooves 1c in the disconnected ways J tends to hold the ways together rather than to spread them apart, as would occur if adovetailed fitting were em loyed; and the advantage of an angular tting with its facility to compensate for wear, is thus secured without the disadvantage of the dovetailed form.

The ways are necessarily separated throughout the greater part of their length for the passage of the pitman G back and forth, as it reciprocates the ram, and the ways cannot therefore be tied together to resist any strain, but are enabled to resist all lateral strain conjointly, by the locking action of the triangular ribs m in engage ment with the two grooves 76. The ram is thus more firmly held in a rectilinear path than if fitted, as is heretofore common in such rams, with a flat surface resting upon the Ways, which permits the ram, when crowded toward one of the ways, to readily slip upon the other as it derives no lateral support from the opposite way. In the present construction, the rigidity of both sides of the frame is at all times united by the engagement of the two ribs with the grooves upon the separate ways, and the ways thus operate conjointly in guiding the ram.

Having thus set forth the nature of the invention what is claimed herein is:

1. In a crank-planer of the class described, the combination, with the frame A having disconnected parallel ways J upon the top with the parallel triangular grooves 76 in-their upper surfaces, of a pitman with means for oscillating it between the ways, the ram G linked to the pitman and carrying the tool H at the forward end and having flanges E at the opposite edges each provided upon the under side with a triangular rib m fitted to one of the grooves Zc, and means for holding the said ribs in engagementwith the said grooves, whereby the sides of the frame are locked together by the engagement of the ribs and grooves, and operate jointly to resist any lateral thrust upon the ram.

2. In a crank-planer of the class described, the combination, with the frame A having disconnected parallel ways J upon the top with the parallel triangular grooves 7c in their upper surfaces, of a pitman with means for oscillating it between the ways, the ram G linked to the pitman and carrying a tool H at the forward end and having flanges E at the opposite edges each provided upon the under side with a triangular rib m fitted to one of the grooves 7c, and a seat upon the upper side of the flange, with a longitudinal gib I secured upon the top of each frame and fitted to the said seat, whereby any tendency to spread the ways J apart is avoided, the gearing for reciprocating the ram being located between the frames A, substantially as herein set forth.

3. In a crank-planer of the class described, the combination, with the side-frames A having disconnected parallel ways J at the top with triangular grooves k therein with a pitman I oscillated between the said ways, of the ram Gr linked to the pitman and carrying the tool H at the forward end and having flanges E at the opposite edges, each having a triangular rib m upon the under side fitted to the groove 72, and upon the upper. side the rabbeted seat having faces 'm and m with a longitudinal gib I secured upon the top of each way, and having its lower and inner sides fitted to the said faces to resist upward and lateral movement of the ram, the gearing for oscillating the pitman being arranged between the frames A, substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

HENRY E. EBERHARDT. ELMER G. EBERHARDT. Witnesses:

HENRY J. EBERHARDT, THOMAS S. CRANE. 

